Improvement in saw-guides



dimmi mes met (fettine.

C. IURDYLOF BEDFORD, OHIO.

Letters Patent No. 98,189, dated December 21, 1869.

IMPROVEMENT IN SAW-GUIDES.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom it may concern:

Be it known that I, C. PURDY, of Bedford, in the county of Cuyahoga, and in the State of Ohio, have invented certain new and useful Improvements in Guides for Band-Saws; and-do hereby declare that the following is a full, clear, and exact description great extent, which must always occur where'the 0rdinary stationary guidesv areused.

1u order to enable others skilled in the art to which my invention appertains, to make and use the same, I will nowproceed to describe its construction and operation, referring to the annexed drawings, in which- Iiigure l is a plan View, part in section;

Figure 2 is a front view; and

Figure 3 is aside view.

In an upright or vertical bau-suspended above the table ofthe machine, is attached, by means of a sleeve, the guide-arm A, to which is secured the block B.

Upon the front or face of the block B, are guidewheels, O C, attached to conical shafts or bearings, D D, on eaclrside of the saw.

'lhe front edges c of these .wheels are bevelled, so as to admit the set of saw passing without injury.

These wheels (C C) run in eccentric bushings, E, which are each provided with a square, G, on the back end, for the purpose of being adjusted to the thickness of the saw, which is done by turning the bushings slightly, and securing them in rposition bya set-screw, b, on top.

.lhere are, also, on back end of the bushings E E, screws, d d, for the purpose of tightening the conical shafts D D7 when worn.

0n the lower side, or back of the guide-wheels C O, is another wheel, H, attached to a slide, 1, which is adjustable back and forth, and held to place by setscrew epressiug against the side of the slide.

The wheel H is for the back of the saw to run against, and may bc moved forward as the width of the saw requires, or so much as to prevent the sawteeth from bearing against the metal beyond the bevelled edges a a provided for the set, on the upper wheels C C. 4

This lower guide-wheel has a groove, e, cut in its edge, for tbe purpose of holdin g'the saw centrally, and isA pvoted within the-slide I, by means of screws-.h h.

Within the blocln..aroundeach of the bushingsm E, is an oil-chamber, jl',v and through the bushings are passages, in m, to conduct the oil on to the bearings D D.

The oil is admitted from the top of the block B,

' through an opening made for that purpose, which' openingl is closed by a screw, g.

The great failure, heretofore, in band-saws, has been in consequence of not having a propel' guide'to control the saw. With my guide, there is no difficult-y; the saw keeps perfectly cold, thereby preventing expansion and slipping from: the pulleys.

Having thus fully described my invention,

Vhat I claim as new, and desire to secure by Let-y ters Patent, is-

1. 'lhe'adjustable guide-wheels C C, for the sides of saw, with the conical bearings D D, 'made substantially in the manner, and for the purposes speciiied.

2. The eccentric bearing-boxes E E, provided with screws, or other equivalents, for adjusting the conical bearings D D, and provided wit-h self-oiling devices, all constructed and arranged substantially as and for the purpose specified.

v,3. The back' guide-wheel H, arranged with adjustable slide I, held in position with screw h, and providedwitli groove t', substautialiy in the manner and and for the purposes specified.

In testimony that I claim the foregoing, I have hereunto set-.my hand and seal, this 11th day of 0ctober, 1869.

- C. PURDY. [L s] Witnesses:

LINN 1?. TARBELL, L. TARBELL. 

